Home / 1,081.36-1,622.20-387.88

Finding the Fourth Proportional to 1,081.36, 1,622.20 and 387.88

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Solution

The fourth proportional to 1,081.36, 1,622.20 and 387.88 is: 581.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.36 : 1,622.20 = 387.88 : x
  2. Step 2: Convert to fraction form
    1,081.36/1,622.20 = 387.88/x
  3. Step 3: Cross multiply
    1,081.36x = 1,622.20 × 387.88
  4. Step 4: Simplify right side
    1,081.36x = 629,218.94
  5. Step 5: Solve for x
    x = 629,218.94/1,081.36
  6. Step 6: Final answer
    x = 581.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.